Improvement in circular-saw mills



w, c. HART.

Improvement in Circular-Saw Mills.

Patented July 16,1872.

N0.129,553. Fly! N [My 11 Q E Witnesses 17212874302;

. aw 6 WM UNITED STATES I PATENT OFFICE.

WILLIAM G. HART, OF FULTON, ASSIGNOR OF ONE-HALF OF HIS RIGHT TO HORACET. OROFOOT, OF HANNIBAL, NEW YORK.

IMPROVEMEN T IN CIRCULAR-SAW MILLS.

Specification forming part of Letters Patent No. 129,553, dated July16,1872.

To all whom it may concern:

Be it known that I, WILLIAM G. HART, of Fulton, in the county of Oswegoand State of New York, have invented an Improved Feed Apparatus forSaw-Mills and Circular Saws; and I do hereby declare that the followingis a full and exact description thereof, reference being had to theaccompanying drawing making part of this specification- Figure 1 being atop view of the apparatus or device as applied to a saw-mill or acircular saw, exhibiting such parts of the saw-mill in connectiontherewith as show the operation of the device; Figs. 2 and 3, views ofparts thereof detached.

Like letters designate corresponding parts in all of the figures.

Letters A A represent the frame-work in which the feed device ismounted, and B a circular saw for a saw-mill or for any other purposerequiring the stuff to be regularly fed up to it on a carriage and thenrun back. The carriage (not shown in'the drawing) is driven forwardtoward the saw and .run back by means of a pinion, O, on a shaft, 1),gearing with a rack on the carriage. On the shaft D is a disk or facewheel, E, against which the peripheries of two continually-revolvingfrictionalwheels, GandH, are alternatelypressed, and by the friction oftheir contact cause the disk or face wheel to turn either one way or theother, and, therefore, to drive the carriage forward or backward. Thewheel G, revolving in the direction indicated in Fig. 1 by the arrow,drives the carriage forward, and the wheel H, turning in the directionindicated by the arrow thereon, is situated on the opposite side of thedisk-shaft and drives the carriage backward. The wheel G is small, so asto drive the carriage forward slowly, as required, and the wheel H iscomparatively large in diameter, so as to run the carriage back quickly.With this construction the two wheels may be run at equal speed. Theyderive their motion,

bevel-wheel, h, on the shaft K of the frictionwheel G, and the piniOn ggearing into a bevel-wheel, 'i, on the shaft L of the frictionwheel H,all substantially as shown in Fig. 1. In order to bring the twofriction-wheels G H alternately into action on the disk or face wheel Ethe adjacent ends of their respective shafts K L are mounted in bearingsM N, (seen most clearly in Fig. 2,) which have a lateral vibratorymovement on pivots k l, respectively, so that either wheel can bebrought into contact with the disk, or separated from it. To effect thisswinging movement of the shaft-bearings M N they are connected,respectively, by rods m n, with a horizontallyvibrating lever, O,pivoted in a suitable position to the frame-work, and having aright-angled projecting arm, 1), which is connected by a rod, 1', with ahandle, P, all substantially as shown. On moving the handle P in onedirection the feeding-up friction-wheel G is pressed against the disk E,and on moving the handle in the other direction the wheel G is separatedfrom the disk, and the runningback Wheel H is brought into contact withthe disk. Any equivalent device may be employed for bringing the wheelsG' and H alternately into contact with the disk or face wheel. In orderto vary the rate of feed with a constant speed of the feedfriction-wheel G, the latter has a sliding movement on its shaft K, soas to bring it nearer to or further from the center of the disk E. Thissliding movement is efl'ected by meansof a sliding bar, Q, (shownseparately in Fig. 3,) bearing a clutch-fork, s, which embraces a neck,t, on the wheel G. This bar slides over a guide-pin, u, and is moved bymeans of a vibrating lever, B, pivoted to the frame at v, and operatedby ahandle, S, connected therewith by'a connectingrod, w or anyequivalent device may be employed. A feather, x, on one side of theshaft K, over which a notch in the eye of the wheel G slides, preventsthe wheel from turning on its shaft.

What I claim as my invention, and desire to secure by Letters Patent,is-

. 1. The devicefor feeding up and. running back a saw-carriage,consisting of the disk or nately into contact with the diskE,-substanface wheel E and friction-wheels G H, comtially as hereinspecified.

bined; arranged, andoperating substantially Specification signed by methis 27th day of as herein specified. February, 1872.

2. The combination and arrangement of the vibratory shaft-bearings M N,vibratory lever Witnesses: O, handle P, and. their connecting-rods m, n,D. F. AGKER, and 7', for bringing the Wheels G and H alter- E. P.BARRETT.

WILLIAM G. HART.

